matically corrected for the time-base frequency tempera-
ture error, before being displayed.
Oscillator Version:
Uncompen-
sated
MTCXO
Stability against:
Ageing per month < 5 *10
-7
< 1 *10
-7
per year < 5 *10
-6
< 5 *10
-7
Temperature changes 0 to
50°C
< 1 *10
-5
< 2 *10
-7
Line voltage changes 10% < 1 *10
-8
< 1 *10
-9
Auxiliary Functions
Power On/Off
Switches counter power on/off. At power up a self-test is
made and the counter is set to default settings.
Default Settings,
Function:
FREQ A
Measuring-Time:
0.2 s
Trigger-Level Offset:
AUTO
Reset
The RESET-button has three functions:
RESET Starts a new measurement. The settings
are not changed.
LOCAL Makes the counter go to LOCAL operat
ion, when in remote operation (unless Local
Lock-Out is programmed).
START/STOP Opens/closes the gate in TOTALIZE A or B
manual mode.
Measuring-Time
A measuring-time of 0.2 s, 1 s, 10 s or SINGLE can be
selected.
NOTE: When SINGLE is selected together with PE-
RIOD, or WIDTH, the result is a single cycle
measurement, but SINGLE together with FRE-
QUENCY or RPM results in a fixed 3 ms Meas-
uring-time.
Measuring Rate: Approx. 5 measurements/s.
Display Time: Normally the display time equals the set
Measuring-time. When SINGLE is selected, a display
time of 0.1 seconds is used.
Displ Hold/Store A
0
The DISPL HOLD/STORE A
0
button has two functions:
DISPL HOLD The result of the current measurement will
be frozen on the display. A new measurement starts
when RESET button is pressed.
STORE A
0
This function is active in FREQ A measure-
ments only. When the button is pressed for > 1 s, the re-
sult on the display is stored as the constant A
0
, which is
used for the calculation of frequency difference (A-A
0
)
and ratio (A/A
0
).
Blank Digits
This function blanks any number of least significant dig-
its on the display, in order to hide unstable digits on the
display.
Optional Accessories
GPIB-Interface, PM 9604
Mounting: Inside counter cabinet.
Interface Functions: SH1, AH1, T5, L4, SR1, RL1,
DC1, DT1, E2
Address Setting: Switch selectable at rear panel be-
tween 0 and 30. Factory preset at 10.
Programmable Device Functions:
Measuring functions
Measuring-time
Trigger slope
Manual Totalize gate control
Output separator selection
Device clear
Device trigger
High-speed dump
MTCXO on/off
Short output format
Free run/Triggered measurements
Set SRQ-mask
Program data out queries
Device identity query
Programming Code Format: 7-bit ISO code (ASCII)
characters. Both upper and lower case characters are
accepted.
Input Separator: The counter accepts the following
characters as separators:
ETX, ETB, CR, LF, ’ ’(space) ’,’(comma), ’:’(colon)
’;’(semicolon).
Page: 38 SPECIFICATIONS
PM 6669 - OPERATORS MANUAL
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